peickett



2 Sheets-Sheet 1.

(No Model.)

J. PRIOKETT.

MACHINE FOR REDUCING WOOD T0 PAPER PULP.

Patented May 8,1883.

ATTORNEYS.

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WITNESSES N. PETERS. Pmlu-Lmw n mr. Wuhingiam 0,6

(No Model.) 2 Sheets-Sheet 2. J. PRIOKETT.

MACHINE FOR REDUCING WOOD TO- PAPER PULP.

Patented May 8,1883.

, UNITED STATES.

PATENT OFFICE.

JOSHUA PR-IOKETT, OF MARINETTE, VVISOONSIN, ASSIGNOR OF TYVO-THIRDS TO WALTER S. PRIOKETT AND ALBERT H. MELLEN, OF SAME PLACE.

MACHINE FOR REDUCING WOOD TO PAPER-PULP.

SPECIFICATION forming part of Letters Patent No. 277,060, dated May 8, 1883,

' Application filed March 12, 1883. (No moan.)

To all whom it may concern: I

Be it known that I, JOSHUA PRICKETT, a citizen of the United States, residing at Marinette, in the county of Marinette and State of Wisconsin, have invented a new and useful Machine for Reducing Wood to Paper-Pulp, of which the following is a specification, reference being had to the accompanyingdrawings.

This invention relates to machines for reducing wood to paper-pulp; and it consists in certain improvements in the construction ot'the same,which will be hereinafter fully described, .and particularly pointed out in the claims.

In the drawings hereto annexed, Figure l 1 is a plan view of myimproved paper-pulp machine. Fig. 2 is a side viewof the same. Fig.

3 is a vertical transverse sectional view. Fig. 4 is a vertical longitudinal sectional view, and

Fig. 5 is a horizontal sectional view.

The same letters refer to the same parts in all the figures.

A in the drawings represents a suitable frame or base supporting a pair of grooved track rails or ways, B B, upon which slides a 2 5 casing, O, which may have V-shaped ribs upon its under side to engage the grooves in the track-rails. Suitable mechanism is to be provided for imparting a reciprocating motion to the said casing, which latter may, as in the 0 drawings, be provided with a longitudinal rack upon its under side, as shown at D, to engage a gear-wheel, E, upon a transverse shaft, F, to which motion may be conveyed in any convenient manner. I would have it understood that l 3 5 any desired mechanism may be employed for reciprocating the said casing.

G is the grindstone, which is placed in the casing G, where it is surrounded by flanges H, projecting upward from the bottom of the cas- 0 ing, and which serve to retain the stone securely in its proper position. The stone may be supported upon strong and powerful setscrews I in the bottom of the casin g, by means of which it may be raised, so as to compensate 5 for wear. In this manner the stone may be used until worn quite thin. The ends of the casing G are provided with spouts J, through which the pulp passes into suitable tanks or receptaclesplaced underneath, and from whence it may be conveyed in the usual manner to the shakers.

K is a frame arranged above the casing O, and supporting a circular guide'or way, L, upon which is mounted a horizontally-revolving gear-wheel, M, to which motion may beiniparted through a pinion, N, from any suitable power. An additional circular guide, 0, located above the gear-wheel M, may be connected to the guideL, and supported by the latter by means of suitable brackets.

P is a square or rectangular vertical casing arranged within the gearwheel M, and connected securely to the latter by means of corner clamps or brackets N N. It will thus be seen that a rotary motion is imparted to the 6 vertical casing P, the lower edge of which latter is adjustedashortdistanceabove the stone. The casing 1? is provided with a suitable door,

Q, near its upper end, through which the wood to be ground may be placed in the box orcas- 7o ing. Said door should be-flush with the inner side of the casing, and it must be capable of being closed absolutely water tight. The upper end of the casing P has an opening for the passage of a hollow or tubular piston rod, 7 5 R, for which a packing-box, S, is provided.

T is a follower, connected to the lower end of the piston-rod R bya universaljoint,U; andV is a piston, which is firmly mounted upon the rod R a short distance above the follower.

W is a small cylinder, arranged vertically above the casing P, and supported by suitable frame-work, which is not shown in the drawings. The lower end of said cylinder has an opening surrounded by a packing-box, X, for 85 the passage of the piston-rod R, the upper end of which is open and extendsinto the cylinder W, as shown. 'The upper end of the cylinder W is connected by a pipe, Y, with a supply of water under pressure, which may be furnished 9 either by havinga suitable head of water, by a pump, or in any other convenient manner.

A pressure of only about nine pounds to the square inchis required; butthismay of course be varied to suit circumstances.

The casing P is provided near its lower end, on opposite sides, with seats Z Z for a pair of valves, A A to the shanks of which, B are pivoted the lower ends of levers O, which are pivoted to brackets D upon the sides of the rco casing, above the valve-seats. SpringsE, the tendency of which are to open the valves, conend of the levers 0 holding the latter outfrom the sides of the casing, and thus keeping the valves closed When the piston passes below the valves A the arms G3 are struck by a collar which is loose upon the piston-rod, and which will be presently more fully described.

The levers F are thus disengaged from the levers G the upper ends of which are then forced inwardly by the springs E, thus auto matically opening the valves A The piston rod It is provided with a fixed collar, A, under which a loose collar or sleeve, B is arranged, as shown. The sleeve B is connected by ropes or chains 0 with a shaft, D located transversely above the cylinder W, and having a grooved wheel, E operated by a rope or in any suitable manner.

The tubular piston rod It is provided with openings F just above the piston V, and 'below the latter, above the follower T, it is also provided with one or more small openings, G The revolving casing P is tobe surrounded with a cylindrical casing, H of sheet metal, in order to prevent the atmospheric resistance, which would otherwise be caused by the fanlike action of the said casing when it is in operation rapidly revolved.

The operation of my invention is as follows: The wood to be ground is fed into the casing I through the door Q, which is then closed tightly. Water is then turned into the cylinder W, passing through the tubular piston-rod and through the openings F in the latter into the casing P, above the piston, which is thus forced downwardly, causing the follower T to press the wood contained in the casing against thestone. To the latter a slow reciprocating motion is imparted, as described, and at the same time the casing containing the wood is revolved rapidly-abont five hundred revolutions per minute. later passes at the same time through the opening (I in the piston-rod into the lower part of the casing, whereit percolates through the wood, which is thus reduced, by the combined reciprocating motion of the stone and rotary motion of the casing, to an impalpable pulp. When the piston passes below the valve Z, the latter opens, thus causing the water to be discharged from the upper end of the cylinder and run to waste or be disposed of in any suitable manner. The pressure in the upper end of the cylinder thus ceases, and the piston remains stationary. By turning the shaft D the piston-rod, with its attachments, may now be raised and the door Q opened for a fresh supply of wood. The pulp readily passes, in the manner above described, to the receiving tank or tanks.

I claim as my invention and desire to secure by Letters Patent of the United States-- 1. In a machine for reducing wood to paperwith the pulp, the combination, with a fiat reciprocating grinding'stone, of a revolving casing containing the wood to be reduced, as set forth.

2. In a machine for reducing wood to pulp, the combination of a flat reciprocating grinding-stone, a revolving casing containing the wood to be ground, and mechanism for forcing the latter against the face of the stone, as set forth.

3. The combination ofthe vertical revolving casing, the horizontal reciprocating casiu g, the grinding-stone arranged in the said horizontal casing, and means for adjusting the said grinding-stone vertically, as set forth.

4. The horizontal casing having flanges projecting upwardly from its bottom, set-screws working vertically in its bottom, and dischargespouts at one or both ends, in combination with the grinding-stone mounted in said cas in g, as set forth.

5. In a wood-grinding'machine, the vertical, square, or rectangular casin g mounted within a horizontal gear-wheel, in combination with suitable guides or supports for thelatter, and operating mechanism, as set forth.

6. In a wood-grinding machine, the combination of a vertical revolving casing, a tubular piston-rod moving vertically in thesame, and having a piston near its lower end, a follower connected to the lower end of said piston-rod by a universal joint, openings in the tubular piston-rod above the piston, andmeans for conducting water under pressure into the upper part of the casing through said tubular piston-rod, as set forth.

7. The combination of the vertical revolving casin g, the tubular piston-rod moving vertically in the same, and having a piston and a follower, as described, and means for conductin g water under pressure through the said piston-rod into the said casing, above the piston and between the latter and the follower, as set forth.

8. The combination of the vertical revolving casing, the tubular piston-rod moving vertically in the same, and having a piston and a follower, as described, openings in the said piston-rod above and below the piston, a cyl inder arranged above the oasin g and receiving the upper open end of the piston-rod, and means for admitting water under pressure into the saidcylinder, and thence through the tubular piston-rod into the casing above and below the piston, as set forth.

9. The combination of the vertical revolving casing, the tubular piston-rod moving vertically in the same, and having a piston and a follower, means for admitting water under pressure into the casing above the piston, and a valve arranged in the side of the casing and arranged to be opened automatically when the piston passes below the same, as set forth.

1.0. Asan improvement in machines for reducing wood to pulp, the combination of a horizontal reciprocating grinding-stone, arranged in a suitable casing, having spouts at one or both ends for the escape of the pulp, a

IIO

vertical revolving oasin g containing the wood to be ground, a tubular piston-rod working in said casing, and having a piston and a follower, means for admitting water under pressure through the said tubular piston-rod into the casing above the'piston and between the latter and "the follower, an automatic discharge-valve, and suitable operating mechanism, as set forth.

11. In a wood-grinding machine, the combination, with the rectangular revolving casing containing the wood to be ground, of a oylindrical sheathing for the said casing, whereby the atmospheric resistance caused by the fanlike action of the said casing when revolving 1 5 rapidly is prevented, as set forth.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

JOSHUA PRIOKETT.

Witnesses AMos HOLGATE, GEORGE CLARK. 

